2000 GMC Yukon

Certain vehicles were built with fuel module reservoir assemblies that contain fuel pump wires and/or connectors that may overheat under certain operating conditions.  Fuel pump wires that overheat may become exposed and result in one or more conditions; 1) If the ignition circuit wire is exposed and shorts to ground, the fuel pump fuse will blow, disabling the fuel pump and causing an engine stall or no-start condition.  2) If sufficient heat is conducted to the pass-through connector, a hole in the connector may result, which may cause the Service Engine Soon light to be illuminated during the emission system diagnostics routine.  Fuel vapour (and in some limited cases liquid fuel) may leak out of the fuel tank through the hole in the connector body.  3) If the ignition circuit or ground wire is exposed and shorts to the fuel level sender card wires, inaccurate fuel level readings may result.  Correction: Dealers will affect repairs.

Certain vehicles are equipped with a hydraulic pump driveshaft that can fracture, resulting in immediate loss of hydraulic power steering assist.  On certain vehicles equipped with Hydro-Boost power brakes, the same condition can result in loss of power assist for braking after the reserve pressure is depleted.  Correction: Dealers will replace the hydraulic pump.  This action is deemed a Customer Satisfaction Campaign and is not being conducted under the Safety Act.

Certain vehicles located in Ontario, Quebec, New Brunswick, Nova Scotia, Prince Edward Island, and Newfoundland & Labrador may experience unwanted Antilock Brake System (ABS) activation and increased stopping distances during low-speed brake application (less than 16 km/h and greater than 6 km/h).  This condition does not set any ABS codes nor does it illuminate the ABS warning lamp.  Correction: Dealers will remove the wheel speed sensor and thoroughly clean the wheel speed sensor mounting surface on the bearing, apply Zinc-X to the cleaned surface, grease the mounting surface, reinstall the wheel speed sensor, and check the output voltage to ensure the wheel speed signal is within specifications.

Certain vehicles have an air bag sensing diagnostic module (SDM) which contains an anomaly that could result in the driver and passenger's air bag failing to deploy during certain frontal collisions. In a vehicle crash, front seat occupants may receive more severe injuries. Correction: Dealers will recalibrate the SDM.

Certain vehicles may have loose or missing rear wheelhouse plugs. Under certain operating conditions, exhaust gases can flow forward and accumulate in the rear wheelhouse. These exhaust gases could flow into the passenger compartment if the wheelhouse plug is missing or loose and may cause possible illness, unconsciousness or death.  Correction:  Dealers will inspect for loose or missing wheelhouse plugs, and install new plugs if necessary.